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Acquisition of Pharmasset, Inc. Other Transaction Costs (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Business Combinations [Abstract]      
Business Acquisition, Cost of Acquired Entity, Transaction Costs $ 9,040 $ 28,461  
Bridge Financing Costs Associated with Acquisition 7,333 23,817  
Restructuring Charges 8,343 0  
Other Costs Associated with Acquisition $ 24,716 $ 52,278 $ 16,400